If n is a positive integer and n^2 is divisible by 18…

If n is a positive integer and n^2 is divisible by 18, then what is the largest positive integer that must divide n?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #38024